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RESEARCH PAPERS

Gladys McCall Geopressured Reservoir Analysis—June 1987

[+] Author and Article Information
T. D. Riney

S-Cubed, La Jolla, CA 92038

J. Energy Resour. Technol 110(4), 262-268 (Dec 01, 1988) (7 pages) doi:10.1115/1.3231391 History: Received January 22, 1988; Revised September 06, 1988; Online October 22, 2009

Abstract

The Gladys McCall geopressured reservoir consists of an interbedded sequence of relatively thick sands and thin shales. The lateral extent of the reservoir is not well defined. Gladys McCall Well No. 1 produced approximately 4.0×106 m3 (25×106 barrels) of brine from Sand Zone No. 8 from October 7, 1983 through May 1987. Analysis of the flow data from the well has led to the development of a conceptual model of the reservoir, which depends on cross-flow from sands overlying/underlying Sand Zone No. 8 for the observed pressure maintenance. The fluid source is remote from the well in the sense that the fluid from the neighboring sands must flow a long distance to find a vertical pathway around the intervening shale stringers in order to recharge Sand Zone No. 8. A reservoir simulation model based on the conceptual model provides an excellent match to the detailed downhole pressure buildup measurements made during the original Reservoir Limits Test and two subsequent short-term buildup tests. The model has also been employed to match the production history of the Gladys McCall No. 1 well and to predict future reservoir response. Nevertheless, the reservoir model employed is not unique and alternate models for pressure maintenance are also being investigated.

Copyright © 1988 by ASME
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